hsr-benelli S-series Service Manual page 54

Valve Spring Inspection
The following procedure is valid for all valve springs.
Measure the length (a) of the free valve.
If the value does not enter within the envisaged limits, change
the spring.
FREE VALVE SPRING LENGTH
External valve spring
Tollerance limit: 37 mm
Internal valve spring:
Tollerance limit: 34.0 mm
Bring the spring to a value length (c) and check the value of
the
load:
VALUE LIMIT
External spring length: 23.2 mm
Load value limit: 565 N
Internal spring length: 21.2 mm
Load value limit: 314 N
Check the inclination (a) of the valve spring as illustrated in
the figure.
If (a) does not enter within the specific value, change it.
VALUE LIMIT
INCLINATION SUCTION SPRING A = 2 mm
INCLINATION EXHAUST SPRING A = 2 mm
ver.2009_03 Page 54/215